Removable water-holding arch-plate.



C. H. FELDM-ANN.

REMOVABLE WATER HOLDING ARCH PLATE.

APPLICATION FILED DEO.14, 1908.

Patented May 10, 1910 CHARLES H. FELDMANN, or PORTLAND, OREGON.

REMGVABELE WATERAHOLDING': ARCH-PLATE.

To all whom it may concern:

Be it'known that 1, CHARLES H. Fann- MANN, a citizen of the United States, and a resident of Portland, in the county of Multnomah and State of Oregom-have invented a certain new and, useful Improvement in Removable Water-Holding Arch- Plates, of which the following is a specification, reference being had to the accompany? ingdrawings as constituting a part thereof.

My invention relates to boiler-furnaces of the type generally used, at present, in sawmills, consisting of brick work supporting a horizontal boiler, comprising a plurality of parallel tubes, the rear ends of which open through the rear flue sheet of the boiler into a return flue-chamber, of which the brickwork constitutes three sides of the inelosi-ng walls, and the top of such chamber being closed by a removable cast-iron arch-plate. This construction presents a very convenient type, especially because it affords such ready access to the return fluechamber for cleaning the same, etc. But said arch-plate, by reason of being exposed to intense heat on its under side, and the cooler atmosphere above, frequently cracks and warps out of shape, and then there is danger of fire being caused by reason of the flames and sparks shooting through the cracks and crevices.

My invention, therefore, has for its primary object to overcome this dangerous condition, and I accomplish the same by means of a pan-like water-holding arch plate adapted to be removably supported over the top of the return line-chamber, in combination with means causing a constant circulation of cool water through the archplate and maintaining the water therein at a. constant depth, which means may consist of an inlet pipe,'and an overflow pipe provided in one wall of the arch-plate, ar ranged to dischar e the water overflowing a certain level. 1e How of Water through the pan-like arch-plate is controlled by a" valve so as to cause a suflicient volume of cold water to flow into the heated. Water of such arch-plate, to prevent the evaporation of the water in the arch-plate and maintain the same at a constant level.

The details of construction of my invention are fully illustrated in the drawings, in which:

Figure 1 is a longitudinal section showing a portion of the brick work and the rear end Specification of Letters Patent. Application filed December 14, was.

Patented May 1d, 1910. Serial No. 467,560.

of the tubular boiler therein supported, together with m pan-like arch-plate closing the top of the return flue-chamber at the rear end of the boiler; Fig. 2 is across section through the pan-like arch-plate and through the return tlue chamber; and Fig. 3 is a perspective of my pan'like arch-plate.

Referring now to the letters in. the several views:

it represents the brick work which constitutes the foundation for, and in which the tubular boiler, b, is supported. The rear ends of the boiler-tubes, a, open through the rear flue sheet into the return flue-chamber (Z. The return flue-cha1nber, (Z, is inclosed on three sides by the brick work a, and the'top of the three sides or walls of such brick work are provided with flange-seats in which is removably supported thepan-like arch-plate c, a detail of which is shown in perspective in Fig. 3. Said arch-plate consists'of a body 6, of suflicient depth, the two end walls, 0 and the front wall, 6, are provided with supporting flanges j, by which the hollow are 1.- plate is reinovably supported on the brick workc above the boiler lines. The righthand end of the wall of the arclrplate is made with. an apertured enlargement 9, having an interior thread in which is securetl a discharge pipe 7;, arranged to run out the water within the arch-plate 0, above a certain depth: and a constant supply of cool water is obtained from an. inlet controlled by a valve 2'.

The utility of my pan-like archplate is selt' cvident-.' By reason of having a constant inflow of cold water from the pipe '5, connected with the water main, or other source of supply feeding by gravity the pipe if,

quantity of inflow can be so regulater as to cause a continuous circulation through the arch-plate of cool water maintained atfn constantdepth and thus prevent the arch plate becoming over-heated by the hotifire underneath. The arch-plate is thus prom tccted against the ill edects of unequal "ten'i peratures and is no longer liablejto wart or crack, and inshort m improvement; ren ders the arch-plate an e ective and depend able closure for the top of the return flue chamber.

By reason of having the arch plate, a,

removable, ready access is also revided to l rot the return flue-chamber (Z, an other advantages, which are self-evident. are ob g eszese tained. Furthermore, the pan-like arch plate, e, is an inexpensive casting, and the closure means provided for the top end of the return flue-chamber, d, represent an arch-plate being of pen-lilte shape and open at the top, a water inlet pipe arranged to discharge into the pan, and said arch-plate being adapted to discharge the water therein above a predetermined level.

' The combination with ai'ear flue-sheet, of a tubular boiler and a three-sided closure therefor constituting a return flue chamber, of an arch-plate constituting a top closure for such return Hue chamber said :rrcln plate being. of pan-like shape and open at the top, a Water inlet pipe arranged to discharge into the pan, one Well of the archplate being provided with an or fice near the top, and a. discharge pipe inserted in said. orifice.

3. The combination with the rear fluesheet, of a tubular boiler and a three-sided closure therefor constituting a return flue chamber, the top of said three-sided closure being provided with a seat recess, of an arch-plate constituting a top closure for such return flue chamber, said arch-plate being of pan-like shape and open at the top, a flain e rim formed exteriorly on the arch-plate by which the latter is seated in said recess of the three-sided inclosure, a water inlet ipe arranged to discharge into the pan, and to discharge the water tierein above a predetermined level.

et. lhe combination with the rear fluesheet, of a tubular boiler and a1 three-sided closure therefor constituting a return flue i chamber, the top of said threesided closure being provided with a seat recess, of an arch-plate constituting a top closure for such return flue chamber, said arch-plate being of pan-like shape and open at the top, a flange rim formed exteri'orly on the arch-plate by which the latter is seated in said recess of the tl'n"ee-sidcd inclosure, n \'nl\'eeontrolled water inlet pipe arranged to discharge into the pan. one "all of the arch-plate being provided with an orifice near the top. and a discharge pipe inserted in said orifice.

CHARLES H. I IILUBLXNN. 'itnesses (Inuit, Lone, H. M. PHILBRIUK.

said nrch- )lete being adapted A 

